Magnetic Properties of TbFeCo Amorphous Films Deposited on Patterned Underlayer

In this study, TbFeCo with the composition satisfying high saturation magnetization and low coercivity has been selected then the coercivity and magnetization reversal mechanism has been manipulated by using patterned underlayer. At first 50 nm Al films have been deposited on glass substrate then anodization has been carried out at different voltage to have different surface morphology. Tb₁₈Fe₇₀Co₁₂ films with thickness of 20 nm have been deposited on this patterned anodized aluminum. Magnetic properties were measured by using vibrating sample magnetometer (VSM) the film composition was determined by electron probe micro analyzer (EPMA). The surface morphology has been studied by atomic force microscope (AFM). The AFM images of glass substrate shows almost smooth surface and that the as deposited Al surface comparatively rougher with mixture of some large and small islands.The surface roughness of as deposited Al can be improved by anodization. According to the angular dependence of coercivity, the magnetization reversal in TbFeCo films deposited on anodized alumina is dominated by Stoner-Wohlfarth rotation model. At first 50 nm Al films have been deposited on glass substrate then anodization has been carried out at different voltage to have different surface morphology. Tb₁₈Fe₇₀Co₁₂ films with thickness of 20 nm have been deposited on this patterned anodized aluminum.